Page 454 - Excel for Scientists and Engineers: Numerical Methods

Appendix 8

Answers and Comments

for

End-of-Chapter Problems

Chapter 3 Matrices

1. (a) inverse: det = -360

(b) inverse: det = 4

(c) Inverse: det = 0.25

(d) Inverse: det = -1

2. (a) det = 0. If A is a square matrix and two of its rows are proportional or
two of its columns are proportional, the determinant is zero.
(b) det = 1.55431E-15 (c) det =6

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